Tire pressures Radial vs Bias ply does it make a difference

As I am starting to experience the ride on my '68 Polara with "stock size P215 75R 14" radial tires, I question the proper tire inflation. It seems that many modern vehicles recommend around 30 psi whereas our tire pressure recommendations are between 24 & 28 PSI
I believe I pumped mine up to around 30 PSI and now seem to have more road noise than I did at the lower range. The max load pressure on the tire is 44 PSI.
Just wondering is the 24 PSI where I want to be?
Any other thoughts or...

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